Yarn testing device



May 13, 1941. H. NAUMANN YARN TESTING DEVICE Filed Mami 11, 193e 2Sheets-Sheet 1- www, SW W Ht I u? mf...

WNW N llI IIl IIII Illq FIII IIIIIIIIIIIIIIII III I l I IL fd H. NaumannMay 13, 1941.

H.A NAUMANN YARN 'TESTING DEVICE Filed March l1, 1938 2 Sheets-Sheet 2'@JWIN Patented May 13, '1941 YARN TESTING DEVICE Herbert Naumann,Elizabethton, Tenn., assignor to North American Rayon lCorporation, New

York, N. Y., a corporation of Delaware Application March 11, 1938,Serial No. 195,259 s claims.l (o1. 265-19) The present invention relatesto a device for use in the testing of threads or yarns but morespecifically has for its object to devise a novel apparatus for theinstant determination of the denier of a yarn or thread.

It is well known that yarns of different denier have different breakingstrengths and by placing a strand of yarn on testing machines designed'to determine the breaking strength of a yarn the denier of the yarntested may be'deduced. Such machines, however, are usually segregated ina laboratory and it is necessary to carry samples of yarn from thesceneof operations and await the results of .the tests. With the devicecomprising the present invention the denier determination lof the yarnsmay be carried out easily and quickly during the manufacturing processwithout the delay occasioned by carrying samples to the testinglaboratory. n

Another feature of the present invention is that it may be carried fromplace to place as needed. The operation of the instrument is so simplethat anyone may use it. In order to test the yarn it is only necessaryto hold the device in one hand and with the other hand loop the threadbeing measured around the knob provided and then pull the thread untilit breaks. The ldenier of the yarn tested is then read from theindicator dial.

It is therefore one object of the present invention to provide a deniermeasuring device which may be operated without requiring any particu-.lar skill.

Another object of the present invention is to provide a yarn measuringinstrument which is of simple and durable construction and inexpensiveto manufacture. l

Still another object of the present invention is to provide a yarn.measuring instrument of a portable nature and which does not require anysupporting means other than-the hand of the.

' taken on' the line 2 2 oi Fig. l, Y

Fig. 3 is a plan view of the device with the cover plate removed,

Fig. 4 is a cross-sectional view taken on the line 4 4 of Fig. 3 and,

Fig. 5 is a detail sectional view taken on the line 5 5 of Fig. 3.

In the drawings, in which like numerals of reference indicate like partsin all of the figures, I refers to the casing of the measuring instruement in which the operating parts are mounted. Removably attached to thecasing I is a cover plate 2.

The operating parts of the measuring instrument comprise a tubularmember 3 which is slidably mounted in an end wall of the casing I andextends therebeyond.

Securely mounted on the outside end of the tube element 3 is a threadhook around which the test yarn is looped. A

The tubular yeleme'ntv3 has mounted on its other end within the casing Ia carriage 5 to which is attached rollers 6 6. The rollers 6 6 ride ingrooved tracks, one pair of which tracks I I are attached to the bottomof the casing I, the other tracks 8 8 being mounted on the bottom of thecover plate 2.. Such an arrangement greatly facilitates the operation ofthe tubular element 3 by eliminating to a great extent the factor offriction.

Where the tube yextends through the casingv I a bushing 9 is providedhaving a base I0 in tube 3 inwardly against the pull. of a thread loopedaround the thread hook 4.

In order to hold the tube 3m position when it has been pulled out acertain distance a pivoted latching lever I5 is mounted on the carriage5 and meshes with a rack bar I6 preventing return movement of the tube3.

Releasing means for allowing return of the tube 3 comprises a releasing'rod Il which extends through the tube t.

The releasing rod I? has mounted on one end 'thereof a nger knob i8 `andat the other end a purpose I which meshes with a gear 24 secured to ashaft is adapted to contact the bridge portion I9 of the latching leverI when the knob I8 is pushed.

A spring is provided to normally hold thel releasing rod I1 out ofengagement with the latching lever I5. i

Abutment bushings 2I-2I are mounted in spaced relation within the tubemember 3 for the purpose of' limiting the movement of the releasing rodI1 by reason of a collar 22, which is pin con- -nected to the rod I1,contacting one of said bushings at either extreme of the releasingmovement.

Mounted on the carriage 5 is a rack bar-23 25. The shaft carries at itsupperend an indicator handA 26.'

As the tube member 'a is pulled outwardly the' hand 26` is rotatedaround a dia1.21 which is calibrated to indicate the denier of the yarntested.

I changed by releasing the lock nut I2 and screwing the threaded bushing9 inwardly or outwardlyas desired. This novel instrument makes use ofthe fact.

that the breaking strength of a yarn of agiven denier is fairly constantand in more or less proportion to the denier. Therefore, in operationthe operator holds the instrument with one hand and with the other handloops the thread around the thread hook 4, the two ends of the threadbeing held. The operator then pulls with the hand holding the threadthus pulling' the tube 3 outward againstthe tension of the calibratedspring I3. This pull is continued until the thread breaks.- Ashereinbefore pointed out, the indicator hand 26 is rotated around thedia1 21 and on breakage of the thread indicates the denier of the threadwith, said carriage being movable only in an endwise direction withinsaid casing, rollers mounted on said carriage, trackways in said casingin which Asaid rollers ride, a spring mounted to bear against saidcarriage and oppose a predetermined force against the pull of a threadlooped around said thread hook when said tubular member is pulledoutward by said thread, means operatedby said tubular member to indicatein terms of denier the breaking strength of the thread, and

meansto prevent the'return of said tubular member as said thread breaks.

3. A yarn testing device comprising a casing, a

tubular member slidably mounted in an end wall of said casing andextending to the outside thereof, a thread hook mounted on the outsideend of said member, a carriage mounted on the other end of said memberand slidable therewith,

said'carriage being movable only in an endwise Y direction, a springmounted to bear against said carriage and oppose a predetermined forceagainst the pull of a thread looped around said ,thread hook when saidtubular member is pulled outward by said thread, means operated by themovement of, said tubular member to indicate in I terms of denier thebreaking'lstrength of the thread, and means to prevent the return ofsaid tubular member as said thread breaks comprising a pivoted pawlmounted on said carriage, a toothed rack mounted in saidhousing andengaged by said pawl, and meahs to release said pawl fromsaid rack toallow the return of said tubular member.

4. A yarn testingv device comprising a casing, a tubular member slidablymounted in an end wall of said casing and extending to the outsidethereof, a thread hook mounted on the outside end or' said membergacarriage mounted on the other end of said member and slidable therewith,said carriage .being movable only in an endwise direction, a springmounted to bear against said carriage and'. oppose a predetermined forceagainst the pull of a thread looped around said thread hook when saidtubular member is'pulled on the dial and continues to do so until thereleasing rod I1 is operated by the operator pressing' a finger againstthe knob I8 while grasping casing in which said rollers ride, a springmountinner end of saidvtubular member, means to allow only endwisemovement of said carriage, rollers mounted on said carriage, trackwaysin said ed to oppose a predetermined force against the vpull .of athread looped around said thread hook,

and means operated by said tubularfmemberto indicate in' terms of denierthebreakingstrength of the thread.

2. A yarn testing device comprising a casing, a tubular member slidablymounted in an end'wall i 4of said casing and extending to the outsidethereof, a thread hook mounted on the outside end of said member, acarriage mounted on the other end of said tubular member and slidablethereoutward by said thread, means operated by the movement of saidtubular member to indicate in terms of Adenier the breaking strengthofthe thread, and means to prevent the return of said tubular member assaid thread breaks comprising a pivoted pawl mounted on saidl carriage,a toothed rack mounted in said casing and engaged by said pawl, andmeans to release said pawl from said rack to allow the return f saidtubular member, said last mentioned means comprising a rod slidablewithin said tubular member, one end of said rod adapted to raise saidpawl whenmovcd thereagainst, said rod extendngbeyond the outside end ofsaid tubular member, and means to normally hold said rod out ofengagement withsaid pawl.

5.,A yarn testing device comprising a. casing, a tubular member slidablymounted in an end wall ot said casing and extendingl to the outsideride.a spring mounted to bear against said car- Y riage, and oppose apredetermined torce against the pull lof a thread` looped around saidthread hook when said tubularA member is pulled outward by said thread,means operated by the movement of said tubular member to indicate interms vof denier the breaking strength of the aasaoaa thread, and meansto prevent the return of said tubular member as said thread breakscomprising a pivoted pawl mounted on said carriage, a toothed rackmounted in said casing and engaged by said pawl, and means to releasesaid pawl from said rack to allow the return of said tubular member,said last mentioned means comprising a rod slidable within said tubularmember, oneend of said rod adapted to raise said pawl when movedthereagainst, said rod extending beyond the outside end of said tubularmember and means to normally hold said rod out of engagement with saidpawl.

6. A yarn testing device comprising a casing; a tubular member slidablymounted in an end wall of said casing and extending to the outsidethereof; a thread hook mounted on the outside end 'of said member; meansmounted within said casing and bearing against the other end of saidmember to oppose a predetermined force against the pull of a. threadlooped around said thread hook; and means operated by said tubularmember to indicate in terms of denierthe breaking strength of thethread, said last mentioned means comprising a rotatable shaft, anAindicator hand mounted on said shaft and rotatable therewith, a xed gearmounted on said shaft,

4a member slidably mounted in said casing, one

end of said member extending beyond said casing; a thread hog mounted onthe outside end a rack mounted to slide with said tubular memv of said.member; means bearing against the other end of said member tending tooppose the pull of a thread looped around said thread hook.; and meansoperated by saidslidable member to indicate in terms of `denier thebreaking strength of the thread, said last mentioned means comprising arotatable shaft, an indicator hand mounted on said shaft and rotatabletherewith, a fixed gear mounted on said shaft, a rack mounted to Jslidewith sai-d slidable member and mesh with said gear. a carriage rigidlysupporting said rack; and rollers mounted on said carriage.

8. A 'yarn testing device comprising a casing; a member slidablymounted'in said casing, one end of said member extending beyond saidcasing; a thread hook mounted on the outside end of said member; meansbearing against the other end of said member tending'y to oppose thepull of a threadV looped around said thread hook; means operated by saidslidable member to indicate in terms of denier the breaking strength ofthe thread, said last mentioned means comprising a rotatable shaft, anindicator hand mounted on said shaft and rotatable therewith, a fixedgear mounted on saidl shaft, a rack mounted to slideI with said slidablemember and mesh with said gear, a carriage rigidly supporting said rack,and rollers mounted on said carriage; means to hold said slidable memberlfrom returning to its former position after breakage of said thread;and means to release said holding means.

' HERBERT NAUMANN.

